Question about Goodman GMS90703BXA Heater

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Combustion fan and circulating fan running and no heat

This unit has had two new boards put into it, honeywell brand boards. The unit started running the combustion and circulating fans and not producing heat. Two technicians have worked on it and it is still sitting there with the combustion and circulating fans running. have even put in a new ignitor and flame sensor. the loops check out fine, it is not the tstat. Can anyone help with this problem. I paid for expert help but this site will not honor it, wasted that money.

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Check near the squirrel cage fan and see if there is a sail switch.  Sometimes these are used to confirm air movement prior to firing off the gas furnace.  It is simply a square piece of metal on a stick that attaches to a microswitch.  This switch is then depressed when the fan pushes the air (and the metal piece) allowing the burner to fire off.
Hope this helps.

Posted on Feb 04, 2009

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Posted on Jan 02, 2017

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Help- when heater gets to room temp. the circulating fan stops, but fire remains in combustion chamber and the blower motor or exhaust fan continues to run for hours. Toyostive laser 56MH thanks Jim...


Sir,

If there was a flame in the burner and no circulating fan running the stove would over heat in less than 5 minutes. It would show an EE 6 message. Are you sure there is a flame in the pot? The stove does have a safety feature that allows the combustion fan and circulating fan to run continuously in certain cases. This is a rather extreme case. In any event the circulating fan would be running at the same time the combustion fan was on. To get out of that mode turn the stove off and on again. Now you should be able to restart normally. Keep us posted,

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All gas furnaces have a fan control of some sort. Either a mechanical fan control where there is a temperature probe that reaches into the heat exchanger compartment thru a hole in the panel that separates the control part of the furnace(this would be the front of the furnace where all the controls are) from the heat exchanger. This type of control is either a small black plastic control about 4 inches by 2 inches and about 1 1/2 inches thick secured to the panel with 2 screws. Or it is a slightly larger silver colored control that should have a pull off cover. It may say Honeywell on it. Either way the control will need replacing.
The other type of fan control is a solid state control board. This will most likely be located in the indoor fan compartment. It should be located under a covered control box. The box with all the wires going into it. This board will also need to be replaced if your furnace uses this type of fan control. You will need to bring your furnace model and serial number to a dealer that sells your brand of furnace or go online to a parts dealer that carries parts for your furnace. Hope I was of help to you! Good luck!

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Secondly, Verify that the wiring at the thermostat is correct. (R- to red, W to white, G to green etc.)

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